Start The Chiller-Heater After It Has Been Stopped For A Long Period; Checks Before Operation Starts; Checks After Operation Starts; Purge Procedure - York EX Series Installation, Operation & Maintenance Instructions Manual

SECTION 7 – MAINTENANCE
START THE CHILLER-HEATER AFTER IT HAS
BEEN STOPPED FOR A LONG PERIOD
When starting the chiller-heater after stopping it for a
long period, check it according to the following pro-
cedure.

Checks Before Operation Starts

1. Check the insulation of the Control Center and
electric system.
2. Check the operation of the Control Center and
safety devices.
3. Check that the refrigerant blow valve V8 is closed.
4. Check the vacuum level in the machine. Use pres-
sure gauge of the high-temperature generator.
It should be less than -0.1 MPaG.
5. Check the fuel gas supply.
6. Press the Refrigerant Pump Stop button on the
Setting screen.
If the checks show no problems, start the chiller-heater.

CHECKS AFTER OPERATION STARTS

1. 10-15 minutes after the chiller-heater and the so-
lution pump start, check the level gauge of the re-
frigerant tank.
2. If the refrigerant level is within the level gauge,
press the Refrigerant Pump Auto button.
3. Observe the operation for a while. Check that the
refrigerant liquid level does not drop.
4. Use the procedure shown in Purge Procedure on
page 130, to purge air from the low pressure side
(absorber).
Remember: Only deionized water may
be used as the refrigerant in the chiller-
heater
130

PURGE PROCEDURE

Air must be purged from the chiller-heater to maintain
its performance and prevent deterioration of its internal
parts. This chiller-heater has an automatic purge sys-
tem.
Even if the automatic purge mode is used during nor-
mal operation, perform the manual operation for the
purging tank and absorber periodically. For the purging
period, see Table 28 on page 129 .
CAPACITY CHECK METHOD OF VACUUM
PUMP
For commissioning and regular maintenance, check
the capacity of the vacuum pump first according to the
following procedure.
1. Check the oil level in the vacuum pump.
2. If the oil is cloudy, it contains water and must be
replaced with new oil.
See the Operation Manual for the Vacuum
Pump for more information on how to
change the oil.
3. Open the gas ballast (remove the plug).
If the purge unit is operated with the
gas ballast closed, water is left in the oil.
The oil will need to be replaced more
frequently.
4. Set the valves according to pattern A. See Figure
59 on page 141 and Table 27 on page 127.
5. Press the Purge Model Manual button on the Set-
ting screen.
6. Press the Manual Purge ON button. The vacuum
pump starts. The solenoid valves SV1 and SV2
open.
7. After another 1-2 minutes, confirm that the vacu-
um gauge stands at 0 - approximately 1 kPa.
8. Press the Manual Purge OFF button. The vacuum
pump stops.
9. Wait for 30 minutes..
10. Confirm that the vacuum down is within 2 kPa.
FORM 155.32-ICOM1.EN.GB
ISSUE DATE: 10/13/2017
JOHNSON CONTROLS